Neil It's in the city. It's a one-bed flat so it's bijoux - meaning small but attractive. There's a balcony, I've got a couple of deckchairs, and a barbecue...

Rob I can't wait to see it. It sounds perfect. Well, today we're discussing housing - and why in some buildings there are separate entrances for rich and poor residents! So, are you ready for today's quiz question, Neil?

Neil I'm all ears.

Rob OK, so you mean you're listening carefully.

Neil I am.

Rob Right. What does 'social housing' mean? Is it housing for people who...

a) want to buy or rent at a low price?

b) want to live together sharing facilities?

or c) aren't able to pay any rent at all?

Neil OK, I think the answer is a) to buy or rent at a low price.

Rob OK. Well, we'll see if you were right or wrong later on in the programme. So, have you met your neighbours yet, Neil?

Neil Yes - I bumped into one couple as I was leaving for work this morning.

Rob I see. Bump into means to meet somebody by chance. So were they friendly?

Neil Well, they complained about me blocking the communal area with my bike - also about my guitar playing. But apart from that, they seemed nice!

Rob A communal area is an area that is shared by a number of people. Well, I hate to say it, Neil, but your guitar playing is annoying!

Tom Bateman, journalist In front of us here is a 20-storey building. Right about me I got tinted blue glass windows and balconies on every floor as you look from the street. And there is a very plush foyer. A sign in the window says 'luxurious penthouses with spectacular views.'

Neil But this is what the journalist Tom Bateman saw when he went around the other side of the same building.

Tom Bateman, journalist So as you come down the side of the building, you can see the windows - quite small windows - of the flats above here - certainly no balconies. This is a big grey concrete wall and as you walk down an alleyway towards the other door.

Rob So this building has one entrance with a plush - or expensive and luxurious - foyer. And foyer means entrance hall. Then there's another entrance down an alleyway - or narrow passage between buildings.

Neil This entrance leads to flats with small windows and no balconies. Why's that, Rob?

Rob That's because the alleyway entrance is the so-called 'poor door'. There' no swanky foyer or tinted glass windows for these residents because they pay less rent than the people living in the apartments at the front.

Neil Swanky means something fashionable and expensive that is designed to impress people. And tinted glass is coloured glass - so people can't look through your windows.

Rob That sounds useful! Do you have tinted glass windows, Neil?

Neil No, I don't. Tinted sunglasses are all that I can afford. So what do people think about having a rich door and a poor door for the same building, Rob?